Neil Conway wrote:
> Ruey-Lung Hsiao wrote:
>> My problem is: I can't find a way to compare strings in C
>> preprocessor directive since PG_VERSION is defined as something like
>> "7.4.3" or "7.4.6".
>
> You could try using CATALOG_VERSION_NO in src/include/catversion.h as a
> substitute for the version number.
Along those lines, this is what I've been using in PL/R:
#if (CATALOG_VERSION_NO <= 200211021)
#define PG_VERSION_73_COMPAT
#elif (CATALOG_VERSION_NO <= 200310211)
#define PG_VERSION_74_COMPAT
#else
#define PG_VERSION_80_COMPAT
#endif
I wasn't following this thread earlier, but if you need to distinguish
between, for example, 7.4.3 and 7.4.6, the above won't help. If you just
need major Postgres version, it works well.
> I think it would probably be a good idea to add a PG_VERSION-workalike
> that is more amenable to use with cpp, though.
I agree. As an example, here's how it's done for R:
/* * R version is calculated thus: * Maj * 65536 + Minor * 256 + Build * 1 * So: * version 1.8.0 results in: * (1 *
65536)+ (8 * 256) + (0 * 1) == 67584 * version 1.9.0 results in: * (1 * 65536) + (9 * 256) + (0 * 1) == 67840 */
Joe
